Wind tunnel tests on controllable model wind turbines in yaw

摘要

The investigation of multiple wind turbine's interactions through their wakes remains of great relevance and needs further understanding. We present wind tunnel experiments on the influence of yaw misalignment on the power output of a two-turbine array. In this study, model wind turbines were used that comprise a collective pitch control system as well as a load control for partial load conditions. The two identical turbines were set up in the wind tunnel in streamwise displacement, whereas the yaw angle of the front turbine was varied systematically. The power output of the individual turbines and the array as a whole is investigated. We show that the power output of the downstream turbine is asymmetric with respect to the front turbine's yaw angle. Further, this asymmetry holds for the combined power of the turbine array, which could be increased by changing the yaw angle as opposed to the case of perfect yaw alignment.